What makes Mysteria by The Rasmus notable?

'Mysteria' received mixed reviews but was notable for its attempt to blend theatrical elements with mainstream rock, reflecting the band's evolution. It showcased their ability to adapt within the competitive European rock scene, though it did not achieve the commercial success of previous albums like 'Dead Letters.' Released on September 21, 2012, 'Mysteria' marked The Rasmus's seventh studio album, following their 2012 release 'Black Roses.' At this point in their career, the band was navigating a shift in sound, aiming to reach new audiences while maintaining their established fan base. The album represents a growing maturity in their music as they explore darker and more introspective themes.